Lock nut



0. BARR LOCK NUT April 24, 1945.

Filed July 10, 1944 INVENTOR. Oar/ 19 BA /QR BY I Patented Apr. 24, 1945 UNITED STATES PATENT OFFICE LOCK NUT Oscar Barr, Los Angeles, Calif. Application July 10, 1944, Serial No. 544,175

2 Claims.

My invention relates to a lock nut and has for its principal objects, to provide a simple, inexpensive and highly effective nut particularly adapted for use on bolts, tie rods and the like which are subject to vibration tending to loosen and displace the nuts and further, to provide a nut composed of two parts normally inseparably interconnected, with one part mounted for limited rotary movement upon the other part, in order that the latter may be tightly jammed upon the bolt or tie rod.

A further object of my invention is, to provide a nut of the character referred to, which is positive in action, capable of being readily applied to and removed from bolts, inexpensive of manufacture and highly efllcient for the purposes for which it is intended.

With the foregoing and other objects in view,

my invention consists in certain novel features of construction and arrangement of parts which will be hereinafter more fully described and claimed and illustrated in the accompanying drawing in which:

Fig. 1 is a view looking against the inner face of the female member of the nut.

Fig. 2'is a cross section taken on the line 2-2 of Fig. 1.

Fig. 3 is a view looking against the inner face of 'the male member.

Fig. 4 is a cros section taken on the line 4-4 of Fi 3.

Fig. 5 is a cross section taken through the center of the nut with the parts assembled.

Referring by numerals to the accompanying drawing which illustrates a preferred embodiment of my invention, l designates the body of the female member of the nut which may be square or hexagonal in shape and provided with a centrally arranged bolt opening i l Formed in the inner face of member I0 is a shallow circular recess I2, the lower portion of the circumferential face of which i undercut to form an annular groove or channel l3, preferably V- shape in cross section as illustrated in Fig. 2.

A portion of the body of member l0 above groove 13 is cut away for a distance of ninety degrees, more or less, to form an arcuate groove l4, with abrupt shoulders l at each end.

The body l6 of the male member of the nut is similar in size and form, with member I II andhas a centrally arranged bolt hole l1.

Formed on the inner face of member I6 is a centrally arranged circular boss l8 adapted to cocupy the recess I! in member I0 and formed l 9, substantially V -shape in cross section and when member I6 is formed, the outer face of lip I9 is flush with and has the same diameter as the outer face of boss I8.

Formed integral with the outer face of boss l8. below lip I9, i a arcuate lug 20 which may be fifteen degrees, more or less in length and which, when the parts of the nut are assembled, occupies groove i4.

In assembling the parts of the nut, boss-l8 is insorted in recess 12 and sufllcient pressure is now applied to part It to distort and force lip l9 into groove l3.

Thus the parts are interconnected as a result of the engagement of lip l9 and by applying sumcient rotary pressure to either part, the sam may be rotated upon the other part, the length of such rotary movement being limited by the travel of lug 20 in groove l4.

After the parts of the nut are assembled and while lug 20 is located at the rear end of groove M the coinciding apertures l I and I! are threaded as designated by T.

When applied for use, the nut with the wrench received faces coinciding with each other and lug 20 in the rear end of groove 1 4 is manipulated as a one piece nut and screwed onto a bolt, until the outer face of member ID engages the face of the part through which the bolt passes.

To jam and lock the nut male member I6 is engaged by a wrench or like tool and rotated a short distance, thereby jamming member l0 so as to set up direct and reactionary forces and pressure, which will effectively lock the nut on the bolt.

As illustrated in Fig. 1, I prefer to form the groove I4 50 that it gradually decreases in width from one end to the other (as from a to b), with the width of lug 20, equal to the width of the widest end of said groove.

Thus the side wall 0 of the groove is slightly eccentric with respect to the axes of member l6 and boss 18 and so that when member I8 is rotated, the outer face of lug 20 rides along the eccentric face of groove [4, thereby slightly moving the members III and ii in opposite directions, to produce wedging action between said members and cause same to more tightly jam the nut upon the bolt.

To remove the nut, member I4 is engaged and unscrewed independently of members l6 until lug 20 engages the shoulder at the rear end of groove, I4 thus relieving the pressure on both parts of integral with the outer corner of said boss is a lip the nut and the latter fimctioning as a one piece of my improved lock nut may be made and substituted for those herein shown and described without departing from the spirit of the invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. A lock nut comprising a part having a shalsecond part, a boss on the inner face of said second part, which boss is adapted to enter the recess in said first mentioned part, a deformable lip on the outer edge of said boss, which lip enters the groove in said first mentioned parts when the two parts are assembled there being an arcuate ,groove formed in said first mentioned part to the side of the recess therein and 2. lug on the side of said boss for engagement within said arcuate groove when the two parts of the nut are assembled. i

2. A look nut as set forth in claim 1 and the side face of which arcuate groove is eccentric to the axis of the openings through the parts of low recess in its inner face and with an undercut 15 the nut.

groove encircling the bottom of said recess, a

OSCAR BARR. 

